The premium cable giant, which brought its social operations in-house in 2007, chose 360i to create campaigns designed to stir the buzz among fans online. The agency’s team will rep HBO at the same time as the folks at Campfire, the NYC firm responsible for creating several innovative fan engagement campaigns on the channel’s behalf. According to an internal release, Campfire’s latest work for HBO involved the second annual “pledge your allegiance” campaign promoting the release of season 2 on DVD this February.

Click through for a case study video of the release date event, complete with awesome ice sculpture:

The good fortunes of these two agencies just go to show that the public really does reward great work — given what these guys have done for the Oreo account, we can’t wait to see how they handle GoT and True Blood.

Oh, and one more time: if you want to learn more about how 360i creates winning campaigns for clients, check out Mediabistro‘s Social Media Marketing Boot Camp, which runs from April 16-June 4. 360i’s digital communications director Matt Wurst will deliver the first keynote.